so bass traps in corners do nothing, it seems we have been fooled. or are being fooled.

@mulveling Yes indeed, first reflection points (if nothing more) are key. And reflecting on it, Thank you for your many informative posts. 

I want to shave his head.

Don't be so rude to silver haired foxes... I am sorry if mother nature robbed you too soon and left you with nothing but a low WAF bare dome.

(Pretty birds never nest in bare tree...I mean dome.) 

I am a firm believer in diffusion over absorption. 

In my case it's  "1/4/ space speaker placement in the corner between the back wall and side wall. This enhances diffusion and combines with the direct sound from my speakers and garbles up the direct pure sound of the speaker and the room. 

The corner's are treated with 1" pyramid type foam panels. This dramatically  improved the sound of the room cutting down multi reflections from the 1/4 space  coupling corner.

My speakers are older vintage Electro Voice Sentry III studio monitors. Two per side one stacked on top of the other. The top one is upside down with the horns matting together. 

Big Difference with the corner treatment. For those of you with 1/2 space coupling it may not be necessary to treat the rear wall.

The last time I read about bass traps was on Decware's site.  But Mr. Deckert actually has a studio to test his stuff out so I believe him.

The bass traps in corners are typically more like upper bass / lower midrange traps. That's an important and problematic range in a lot of rooms, and a reasonable amount of traps in the corners  can definitely improve the clarity in that range, which can add perceived definition to lower bass and sub-bass, since the overtones are easier to hear than the fundamentals down there, and our ability to perceive start and stop times is much more accurate above 100 Hz than down lower. A lot of people think of under 60 Hz as bass, but that's more like sub-bass, and that's very impractical to control with added acoustic absorbers.